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    <p>I couldn't find many references to it either, but the tutorial you linked to mentions this:</p> <blockquote> <p>The string format and the following arguments are as for Py_BuildValue (XXX so i really should have described that by now!). A call such as</p> <pre><code>PyEval_CallFunction(obj, "iii", a, b, c); </code></pre> <p>is equivalent to</p> <pre><code>PyEval_CallObject(obj, Py_BuildValue("iii", a, b, c)); </code></pre> </blockquote> <p>I suppose <code>PyEval_CallFunction</code> is not public API, as its value seems rather limited. There is not much of a difference between these two. But then again, I'm not really involved in python extensions, so this is just my view on this.</p> <p><code>PyEval_CallObject</code> itself is just a macro around <code>PyEval_CallObjectWithKeywords</code>.</p> <pre><code>#define PyEval_CallObject(func,arg) \ PyEval_CallObjectWithKeywords(func, arg, (PyObject *)NULL) </code></pre> <hr> <p>On the matter of "What is public API?" here is a recent message from Martin v. Löwis:</p> <blockquote> <p>Just to stress and support Georg's explanation: the API is <em>not</em> defined through the documentation, but instead primarily through the header files. All functions declared as PyAPI_FUNC and not starting with _Py are public API. There used to be a lot of undocumented API (up to 1.4, there was no API documentation at all, only the extension module tutorial); these days, more and more API gets documented.</p> </blockquote> <p><a href="http://mail.python.org/pipermail/python-dev/2011-February/107973.html" rel="nofollow">http://mail.python.org/pipermail/python-dev/2011-February/107973.html</a></p>
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    1. CONote that, in the context of Martin's message, being "public" refers to APIs that we won't alter or remove without going through a deprecation process first. It doesn't mean calling an undocumented API is a good idea when a documented alternative is available. In the case of `PyEval_CallFunction`, the documented (and preferred) API is `PyObject_CallFunction` which includes additional steps that `PyEval_CallFunction` assumes have already been dealt with by the calling code.
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